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AssigneeNippon Paint Co., Ltd.
InventorsSeuji Arimatsu, Katsuji Konishi, Yoshifumi Ichinose, Takakazu Hase
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The present invention provides a photosensitive resin composition for lithographic printing, which is developable with an alkali developer and exhibits excellent resolusion and excellent print durability. The photosensitive resin composition comprises (a) an alkali-swellable or alkali-soluble binder resin and (b) an oil-soluble diazo resin, wherein the binder resin has an acid value of 5 to 150 and has in molecules a group represented by ##STR1## wherein R.sup.1 represents a phenyl group which may have a substitution, R.sup.2 and R.sup.3, the same or different, represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R.sup.4 represents an alkylene group of which a backbone may be interrupted with an oxygen atom, a cycloalkylene group or a combination thereof, and may have thereon an alkyl group, a hydroxyl group, an oxo (.dbd.O) group or a combination thereof, and a and b independently shows 0 or 1.
An alkali developable photosensitive resin composition comprising a mixture of an alkali-swellable or alkali-soluble binder resin and an oil-soluble diazo resin, wherein said binder resin has an acid value of 5 to 150 and has in its molecules a group represented by ##STR13## wherein R.sup.1 represents a phenyl group which may have a substitution, R.sup.2 and R.sup.3, the same or different, represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R.sup.4 represents an alkylene group of which a backbone may be interrupted with an oxygen atom, a cycloalkylene group or a combination thereof, and may have thereon an alkyl group, a hydroxyl group, an oxo (.dbd.O) group or a combination thereof, and a and b independently shows 0 or 1, wherein said oil soluble diazo resin is contained in the composition in an amount of 2 to 20 parts by weight, based on 100 parts by weight of the binder resin.
Dependencies are inferred from the claim text.